fix(ui): center OpenWrt Gateway title with its back button

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/src/views/server/OpenWrtGateway.vue

@@ -368,8 +368,10 @@ onMounted(() => load())
 
 <template>
   <div class="pb-6">
+    <!-- mb-0 overrides the pill's default mb-4, which pushed it above the
+         title's centerline in this inline header row. -->
     <div class="flex items-center gap-3 mb-6">
-      <BackButton @click="goBack" />
+      <BackButton desktop-margin="mb-0" @click="goBack" />
       <h1 class="text-lg font-semibold text-white">OpenWrt Gateway</h1>
     </div>